Which one of the following is not an assumption of monopoly market ?

Q: Which one of the following is not an assumption of monopoly market ?

Which one of the following is not an assumption of monopoly market ?

Question

Accepted Answer

The correct option is 4:

The product produced by one firm is a close substitute for the other firms. This statement is **not** an assumption of a monopoly market; in fact, it describes the **opposite** of a monopoly. A core, defining assumption of a pure monopoly is that the single firm produces a product for which there are **no close substitutes**. The absence of substitutes is precisely what grants the monopolist the power to be a price maker and control the market. If other firms were producing close substitutes, the market would be classified as either oligopoly or monopolistic competition, as consumers would have viable alternatives, severely limiting the original firm's control over price and output. Since the question asks for what is *not* an assumption, this false characteristic of a monopoly is the correct answer.

The incorrect option is 1:

There is one seller or producer of a homogeneous product. This is a fundamental assumption of a pure monopoly. A monopoly is, by definition, a market structure where a single firm controls the entire supply of a particular product or service. The single-seller status is the primary source of the firm's market power. Therefore, this condition **is** an assumption of a monopoly and is an incorrect answer to the question asking for what is *not* an assumption.

The incorrect option is 2:

There are no close substitutes for the product. This is one of the most critical assumptions of a monopoly. The monopolist’s product must be unique, meaning consumers have few, if any, alternative products to satisfy the same need. This lack of close substitutes isolates the monopolist from competition, allowing the firm to influence the market price without losing all its customers. As this is a necessary condition for monopoly, it is an incorrect choice for the question.

The incorrect option is 3:

There is pure competition in the factors market so that the price of each input he buys is given to him. This is a standard simplifying assumption made in the theoretical analysis of most market structures, including monopoly. While the monopolist is a "price maker" in the product market, it is typically assumed that they are a "price taker" in the factor markets (e.g., for labor, raw materials, etc.). This means the firm buys its inputs under conditions of perfect competition and must pay the prevailing market price for them, which is a key assumption for cost analysis.